Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 163 for “"loading rate"”.
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Loading Rate Effects on Axial Pile Capacity in Clays
… can damage the pile and may not produce accurate results. There is a relatively new testing method called the Statnamic Testing Method which tests foundation piles at a very fast rate, but still slower than with dynamic tests. As the rate at which load is applied to a test pile increases, the …
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The influence of loading rate on excess pore pressures in triaxial tests
… in this dissertation is concerned with coupled loading and consolidation in triaxial tests and with selection of rates of loading in routine tests to avoid errors due to incomplete drainage or non-uniform pore pressures in fine grained soils. The work consisted of a combination of laboratory …
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A Numerical Investigation of Loading Rate Effects on Pre-Cracked Charpy V-Notch Specimens
To quantify the effects of loading rate on ductile crack growth in CVN specimens, plane strain, finite element analyses are used to model ductile crack extension in specimens subjected to quasi-static and impact loading. The Gurson-Tvergaard dilatant plasticity model for voided materials describes …
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Determining an Appropriate Organic Matter Loading Rate for a Created Coastal Plain Forested Wetland
… native forested hydric soils. However, optimal loading rates for created wetland soil reconstruction have not been rigorously established. Our objective was to determine appropriate organic amendment loading rates for a Coastal Plain mitigation wetland based on 1) soil properties reflective of …
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Laboratory Strength Testing of Argillaceous Limestone Under Varying Saturation, Scale, Loading Rate, and Confinement Conditions
… The effects of specimen saturation, scale, loading rate, and confinement have been investigated through the laboratory strength testing of specimens representative of Cobourg limestone found at depth for the proposed low and intermediate level DGR site. Using standardized laboratory testing …
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Field evaluation of vadose zone purification and the effects of applied wastewater quality and hydraulic loading rate
Includes bibliographical references (pages 145-147).
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The Influence of Hydraulic Loading Rate on Nitrification Performance in a Two-Stage Biological Aerated Filter Pilot Plant
… one, ammonia oxidation stage two) biological aerated filter was operated for 10 months on-site at a domestic wastewater treatment plant. Over the study, the system was operated at different hydraulic loading rates that resulted in a range of applied organic and ammonia mass loadings. Performance …
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Tensile, Creep, and Fatigue Behaviors of Thermoplastics Including Thickness, Mold Flow Direction, Mean Stress, Temperature, and Loading Rate Effects
… thickness, mean stress, temperature, and loading rate. Specimens were subjected to monotonic tension, creep, and load-controlled fatigue tests. The two materials considered were a neat impact polypropylene and a mineral and elastomer reinforced polyolefin. A unique test specimen geometry …
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Towards an improved understanding of the biomechanical implications and risk of injury of barefoot running
… using a 3-D motion capture system and integrated force platforms using conventional methods. We found that loading rate was significantly greater in the barefoot condition, but that high individual variability existed, particularly in the barefoot trials. We found that an increase in ankle …
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Variables Affecting Gas Production in Mesophilic Anaerobic Digestion
… shoved a relationship "between gas yield and loading rate such that a lower loading rate produced a higher gas yield. A computer model demonstrated that the most significant parameters affecting net energy production were gas yield and the feed solids concentration.<br/><br/>Further work …
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Evaluation of shallow-placed low pressure distribution systems in soils marginally suited for on-site waste treatment
… operating: a narrow trench design with a design loading rate of 17.5 Lpd/m², and three designs based on Virginia regulations with design loading rates of 9.0 Lpd/m², 4.5 Lpd/m², and 5.7 Lpd/m². In the Penn-Bucks soil, the LPD system was installed with three subsystem designs operating: a narrow …
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Exploration of Movement Variability and Limb Loading Asymmetry During Simulated Daily Functional Tasks
… populations, for example, joint angle and loading symmetry differences when comparing a clinical and healthy population. Symmetry deficits can impact quality of life and in some cases have been associated with an increase in injury risk. Therefore, it is essential to understand movement and …
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Effects of Sex, Strain Rate, and Age on the Compressive and Tensile Material Properties of Human Costal Cartilage
… this study was to evaluate the effects of sex, loading rate, and age on the compressive and tensile material properties of human costal cartilage over a wide range of subject ages and sexes. Cylindrical compression samples and dog-bone shaped tension samples were tested to failure on a material …
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Influence of storage environment upon crack opening and growth in composite solid rocket propellant
… order to determine the effects of temperature, loading rate, and thickness on this particulate composite, tests were conducted at three temperatures and two loading rates. Both uncracked and edge cracked "biaxial" specimens were produced from solid rocket propellant. The stress relaxation …
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Optimal Parameter Values for Accurate and Repeatable Nanoindentation of Human Trabecular Bone
… thermal drift correction time, dwell time, and loading rate that can be used to obtain accurate and repeatable material properties from human femoral trabecular bone through experimentation and statistical analysis. All testing was conducted using a single nanoindenter on a single trabeculae, …
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Denitrification in low pressure distribution onsite wastewater disposal systems
The effects of effluent type, effluent loading rate, dosing interval, and temperature on denitrification in low pressure distribution, on-site wastewater treatment and disposal systems (OSWTDS) were evaluated in this study. The treatments were surface and subsurface soil horizons; nitrified and …
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Nitrification of Landfill Leachate by Biofilm Columns
… and the age of the landfill. At landfills operated as bioreactors, where leachate recirculation is practiced, leachate ammonia nitrogen concentrations may accumulate to extremely higher levels than during single pass leaching, thereby requiring treatment before final discharge to a receiving …
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Differences in Movement and Loading Variability Between ACLR and Healthy Athletes During Bilateral and Unilateral Landings
… to understand the differences in movement and loading variability between ACLR and healthy athletes during unilateral and bilateral landings while utilizing limb symmetry to understand between group differences. It was hypothesized that females with an ACLR would have greater variability …
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Treatment of clam-processing wastewater using upflow anaerobic sludge blanket (UASB) technology
… It was found that at a volumetric organic loading rate of 13.8 g COD/L/d the BOD₅ removal efficiency averaged 87% and TSS removal efficiency averaged 83%. The average effluent values for BOD₅ and TSS were 200 ppm and 90ppm, respectively. The conversion efficiency of COD to methane gas was …
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Effect of specimen geometry and test configuration on the fracture process zone for asphalt materials
… world, recycled materials are commonly incorporated into asphalt mixtures, to provide environmental and economic benefits by decreasing the use of virgin materials, such as natural or quarried aggregates and asphalt binder, in newly designed asphalt mixtures. However, recycled materials such as …
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